How are prayer times calculated for Slough?
Slough lies at a latitude of about 51.51°N, in Berkshire. Because prayer times depend on the position of the sun at a given location, the timings here are calculated specifically for these coordinates rather than borrowed from another town.
Today the sun rises at 07:38 and Maghrib falls at 17:54, giving 10h 16m between the two. As the year turns this daylight window lengthens and shortens, which is why Fajr (currently 06:11) and Isha (currently 19:24) shift gradually from week to week.
When praying in Slough, the Qibla is faced towards the Kaaba in Makkah, which lies on a bearing of 118° from here, roughly to the south-east — a great-circle distance of about 4,822 km.
Prayer times in Slough are very close to those in neighbouring towns, though they differ by a minute or two with distance. Nearby you can also check Maidenhead (9 km), High Wycombe (17 km) and Harrow (19 km).